Question

Find the zeros of the function algebraically.
f(x) = √8x + 7

Answer 1

ans would be f(0)=7 right ?

Answer 2

That would just give y intercept

Answer 3

so what would be more ....can u explain....

Answer 4

Ok. So you solve the equation in terms of X. \[\sqrt{8}x = -7\]

Answer 5

Then divide both sides by the square root of 8

Answer 6

\[x = -7/\sqrt{8} = -2.474873\]

Answer 7

your answer depends on whether your question is:\[1) f(x)=\sqrt{8x}+7\]or:\[2) f(x)=\sqrt{8}x+7\]i..e is 'x' inside the square root symbol or not?

Answer 8

yea ....bt i have taken it 2nd one...as u written

Answer 9

@amitlpu91 - you have found f(0) rather than (what I believe the question is asking) - find the value for 'x' that makes f(x) = 0

Answer 10

@mlhuyck - can you please clarify whether your question is in form of (1) or (2) above?

Answer 11

bt in this case whatever value plug in for x we can't get f(x)=0 right ...

Answer 12

if the question is of the form (s) above, then @sinusoidal has solved it correctly.

Answer 13

*(2)

Answer 14

watever bt idea is jst like same ......

Answer 15

f(0) is NOT the same as f(x)=0

Answer 16

yea i know...

Answer 17

Evaluating the fuction with x = 0 gives the y intercept

Answer 18

f(0) means that here x=o right...

Answer 19

I believe the equation is of the form (2) above, so @sinusoidal has given the correct solution.

Answer 20

Yes. x = 0 is a y intercept.

Answer 21

y = 0 is an x intercept.

Answer 22

For the graph to intercept the x axis, y must equal zero.

Answer 23

also u can write as f(x)=y .....& hence proceed

Answer 24

you just wrote y = y basically

Answer 25

y and f(x) are both generally the dependent variable.

Answer 26

no it can be considered as f(x)=y so that we can directly plug in value of x and y =0 respectively....got it

Answer 27

as given above equation...

Answer 28

so bcam as f(x) = y =sqr 8x +7 now it is in simplified form ...got it